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As an addition to this, D. Giovannacci, L. Ghelfi sold those stones during their Operations, this was taken from the pricelist from 1897, they traded already 1893 with those stones....

@hatzicho
I think that we are all intetested in a third part.....

Thanks for your explanation....

@muskieman:
You should read the whole thing ;-) as Peter wrote it seems to be a stone mined in one of the older Escher quarries and yes the Cup and i also think the Boy with the knife/razor is a...

Thanks Peter.....and great that you in Person scored that one
....a piece of history and also the only one of this kind i have seen up to date....